from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To surprise or shock; to discomfit.
- v. Of a ship: to catch it with the sails aback suddenly.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. surprise greatly; knock someone's socks off
(nautical) A square-rigged ship is taken aback when the wind blows on the front of the sails. (Wiktionary)